is 2 1913651 - 1
has 576067 decimal digits
takes 0.104 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.527368.6567%20000002620000001.27169.2391%16.799071.5525%2.8958%
PrimeNet2570.010063.1579%90001600000.00143.0420%0.011464.2786%1.1207%
GPU722610.160565.5738%100001700000.00151.7604%0.162066.1798%0.6060%
Difference+6+15.3668+3.0829%+1990000+261830000+1.2701+7.4787%+16.6370+5.3727%+5.3727%

Known prime factors (3 factors, 141.9 bits, 0.00741292% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1913651520513073928.955136
23 × 17
-8171.924e-116.679e-71.281e-6
191365115548797105211340.500406260
22 × 32 × 5 × 37 × 61
2008-07-1537611.481e-73.013e-65.923e-6
191365162402067966553464296172272.4021630445362465608
23 × 34 × 13 × 193547645117
2021-03-2181193547645117965.82829.501,549.3

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
19136518093352162686361410332169.455
1913651324810921588256049195952288304131101.357
1913651970277093757464176748985186090045734112.902
1913651505041911733206795327029428843206542017436143141.857
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:42:16alpertronManual testing5000001500000012-
skipped known factor: 520513073
skipped known factor: 1554879710521
--0.101--5.096%
2021-04-07T15:03:18Dylan Delgadodesktoplinux100000071000000-
skipped known factor: 520513073
skipped known factor: 1554879710521
--0.379--7.167%
2021-07-11T13:30:22Dylan Delgadolaptop-i787502000000262000000-
skipped known factor: 520513073
skipped known factor: 1554879710521
--1.272--9.239%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-07-15T07:48:00J FeitsmaManual testing??40.500137.15719e-80.2211.52563e-7


ECM factoring results:

Old Calculation Method

Total ECM effort:19.885 GHz-days
Estimated T-Level:24.589
DigitsB1CurvesCompleteFacMiss
2011000257 / 1002.5707.555%
2550000257 / 2800.91839.872%

New Calculation Method

Total ECM effort:19.885 GHz-days
Estimated T-Level:24.589
DigitsB1CompleteFacMiss
20110008.7980.015%
25500000.79845.041%
302500000.04995.185%
3510000000.00299.773%


ECM Summary

B1B2factorcurvesGHz-days
500005000000251.736
50000500000040.278
50000660000021416.76
500006750000141.108


Lucas-Lehmer results:
No L-L results for M1913651


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:14:44alpertronManual testing
520513073
1554879710521
2A183F09C4001E__no
2017-10-20T02:04:36Oliver KruseGTX-0
520513073
1554879710521
2A183F09C4001E__no
2021-03-24T04:53:27volkihome
520513073
1554879710521
6240206796655346429617
69075FBFC4A0BF72no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 262000000 (P-1 stage 2)
B1 = 1000000, B2 = 71000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
267
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Last modified: 2022-01-06T11:58:02+00:00